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Finding the Fourth Proportional to 258,068.80, 387,103.20 and 210,829.60

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Solution

The fourth proportional to 258,068.80, 387,103.20 and 210,829.60 is: 316,244.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,068.80 : 387,103.20 = 210,829.60 : x
  2. Step 2: Convert to fraction form
    258,068.80/387,103.20 = 210,829.60/x
  3. Step 3: Cross multiply
    258,068.80x = 387,103.20 × 210,829.60
  4. Step 4: Simplify right side
    258,068.80x = 81,612,812,814.72
  5. Step 5: Solve for x
    x = 81,612,812,814.72/258,068.80
  6. Step 6: Final answer
    x = 316,244.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.